US 11,990,619 B2
Coated cathode active material, method for producing coated cathode active material, and all solid state battery
Koutarou Aoyagi, Toyota (JP); and Takuya Matsuyama, Susono (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Nov. 30, 2021, as Appl. No. 17/538,705.
Claims priority of application No. 2020-199476 (JP), filed on Dec. 1, 2020.
Prior Publication US 2022/0173393 A1, Jun. 2, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01)
CPC H01M 4/58 (2013.01) [H01M 4/0407 (2013.01); H01M 4/0426 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 2300/0068 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for producing a coated cathode active material,
the coated cathode active material including a cathode active material having a granular shape, and a coating portion coating at least a part of a surface of the cathode active material, the method comprising:
a preparing step of preparing the cathode active material, and
a coating portion forming step of forming the coating portion including a scandium lithium phosphate based compound on the surface of the cathode active material by a barrel sputtering method using Li3Sc2(PO4)3, as a target, wherein
a thickness of the coating portion is 5 nm or more and 20 nm or less,
a coverage of the coating portion is 50% or more and 100% or less, and
in the coating portion forming step, a heat treatment is not carried out after the barrel sputtering, and
a molar ratio of Li, Sc, and P in the scandium lithium phosphate based compound satisfies Li:Sc:P=3.00:2.19:2.57.